在间接驱动点火条件下传播真实脉冲的经典射线追迹方案中考虑散斑尺度光束弯曲
Accounting for speckle scale beam-bending in classical ray tracing schemes for propagating realistic pulses in indirect drive ignition conditions
摘要：
提出了一种等离子体流引起的平滑激光束偏移的半解析模型。基于高斯描述的散斑，该模型包括空间，时间和偏振平滑技术，通过从流体动力学模拟发出的配合与近轴描述的电磁波。然后将该光束弯曲模型包含在光线跟踪算法中，并仔细验证。在NIF实验的全尺寸模拟中，当作为后处理应用于内锥的传播时，沿激光路径的光束弯曲会影响黑腔内部的折射条件和能量沉积，并且可以解释异常折射测量，即在一些NIF实验中观察到的所谓闪烁。
英文摘要：
We propose a semi-analytical modeling of smoothed laser beams deviation induced by plasma flows. Based on a Gaussian description of speckles, the model includes spatial, temporal and polarization smoothing techniques,through fits issued from hydrodynamic simulations with a paraxial description of electromagnetic waves. This beam bending model is then included in a ray tracing algorithm, and carefully validated. When applied as a post-process to the propagation of the inner cone in a full-scale simulation of a NIF experiment,the beam bending along the path of the laser affects the refraction conditions inside the hohlraum and the energy deposition, and could explain the anomalous refraction measurements, the so-called glint observed in some NIF experiments.
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